Uniaxial compression mechanical properties and deterioration mechanism of sandstone under different humidity conditions
吴秋红 1杨毅 2张科学 3李逸婧 4陈伟 4刘兆丰4
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作者信息
1. Work Safety Key Laboratory on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China;School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hebei Key Laboratory of Mine Intelligent Unmanned Mining Technology,North China Institute of Science and Technology,Beijing 101601,China
2. School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China
3. Hebei Key Laboratory of Mine Intelligent Unmanned Mining Technology,North China Institute of Science and Technology,Beijing 101601,China
4. Department of Building Engineering,Hunan Institute of Engineering,Xiangtan 411104,China
In order to explore the mechanical properties of surrounding rock mass in high-humidity environment of mine,based on the self-made humidity environment control simulation device,the mechanical characteristics and deterioration mechanism of sandstone samples at different relative humidity conditions(70%,80%,90%and 100%)under uniaxial compression were studied.The results show that:1)With the increase in relative humidity,the porosity of sandstone increases gradually,while the mass and strength decrease obviously,but the corrosion ability of humidity to specimens decreases after reaching a certain time;2)The acoustic emission variation of sandstone under uniaxial compression is consistent with the stress evolution characteristics,and the number of acoustic emission events in the high humidity environment is significantly lower than that under the dry condition;3)As the relative humidity of the environment increases,the fractal dimension of sandstone fragmentation gradually increases,the fractal position parameters and fragment scale parameters gradually decrease,and the fragment size and distribution concentration gradually decrease after sandstone failure;4)The peak diffraction intensity and mineral content of sandstone albite and calcite decrease with the increase of relative humidity,while the size and number of microcracks increase with the increase of relative humidity.The damage and deterioration mechanism of sandstone under high-humidity environment includes the combined effect of physical and chemical erosion.The research results will provide necessary references for the stability control of surrounding rock in high humidity environment of mine.
关键词
高湿环境/砂岩/分形维数/劣化机理/单轴压缩
Key words
high humidity environment/sandstone/fractal dimension/deterioration mechanism/uniaxial compression
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基金项目
National Natural Science Foundation of China(51904101)
Scientific Research Foundation of Hunan Provincial Education Department,China(22B0732)
Scientific Research Foundation of Hunan Provincial Education Department,China(22A0351)
Natural Science Foundation of Hunan Province,China(2023JJ40212)
Hunan Institute of Engineering Student Innovation and Entrepreneurship Training Program,China(23107)
Hebei Key Laboratory of Mine Intelligent Unmanned Mining Technology(North China Institute of Science and Technology),China(iium006)
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